BEGIN:VCALENDAR
BEGIN:VTIMEZONE
TZID:Europe/Berlin
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;VALUE=DATE:20151030
DTEND;VALUE=DATE:20151031
DESCRIPTION:All-day event recurring on tuesday each week
SUMMARY:Recurring All-day Event
RRULE:FREQ=WEEKLY;BYDAY=TU;UNTIL=20341031
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/London:20180522T120000
DTEND;TZID=Europe/London:20180522T130000
DESCRIPTION:Daily lunchtime event with specified hours
SUMMARY:Daily lunch event
RRULE:FREQ=DAILY;UNTIL=20330523T060000Z
END:VEVENT
END:VCALENDAR